Apparatus for forming molds for columns with bases



April 1o, 192s. 1,665,365

- F. H. HUNT ET AL APPARATUS FOR FORMING MOLDS FOR lZOLUMNS WITH BASES Filed April .26. 1926 6 sheets-s116661 April4 1o, 192s.

A F.l H. HUNT ET AL APPARATUS FOR FORMING MOLDS FOR COLUMNS WITH BASESA 5 Sheets-$heetl 5 L III F. Ha HUNT ET AL Filed April 26, 1926 i GRIS/Ei April 1o, 1926.,

APPARATUS FOR vFORIVIING MOLDS FOR CGLUMNS WITH BASES FRANCIS E. HUNT AND FRANK N. ROPE, OF LOS ANGELES, CALIFORNIA, ASSIGNOBS,

BY MESNE ASSIGNMENTS, TO RAYMOND CON CRETE PILE COMPANY, OF LOS ANGELES, CALIFORNIA, A CORPORATION OF NEW JERSEY.

APPARATUS FOR FORMING MOLDS FOB COLUMNS WITH BASES.

Application filed April 26,

Our invention relates to the art of forming concrete foundation columns and more particularly to a novel method of an apparatus for forming a mold for a concrete column, the column having a base formed integral therewith at the lower end. l

The method in general use at present of making a concrete column in which ya base portion of extendedv diameter is cast' integral with the column is as follows: y

A vertical hole is dug from the surface of the ground downwardly to the desired depth, this hole being of a diameter equal to that of the base portion of the column which it is desired to form. y Afwooden form is then constructed in this hole to form a mold for the base portion of the column. A form for the stem of the column is then constructed above the form for the base and communieating with it, the mold for the stem 'cxtending upwardly from the mold for the base to the top of the hole. The column is then cast in the mold thus ormed. lVhen 'the concrete is suiiiciently hardened the wooden form is removed and the space inthe hole about the concrete column is filled in with dirt; .This method is expensive to perform linasmuch as the quantity of dirt necessary viate the vnecessit to be removed in forming a hole of a diameter equal to that of the base portion of the column is many times greater than the volume actually occupied by the concrete column when cast. Moreover, it is expensive to construct Uthe form in the hole after the latter is dug, to remove the form after the column is cast, and to ll in the space about the column with dirt.

Itis an object of our present invention, therefore, to produce a method for forming a concrete foundation column which willv obfor excavating the ex;

. cessive-quantity o dirt which is necessary in -the method of present practice described above.

The novel method of our invention, therefore, comprehends the formation of the mold, in which to castl the concrete column, in the soil itself. This method comprises 'the boring of a hole in the earth, this hole forming the mold for the stem portion of a foundation column. When the hole has ieee. serial no. metta,

reached a desired depth our method contemplates enlarging the bottom portion of the hole to form a mold for a Ibase portion which will be formed integral with the column when it is cast in the hole.

It is therefore the broad object 'of our invention to provide a method of an apparatus for forming a mold for a concrete column with a base,`by boring a vertical hole and enlarging the hole at the lower end to a diameter considerably in excess of that of the hole. n

In the development of our apparatus we found it economicaland otherwise suitable to devise means for forming a base mold in which the power rigging thereof can be used for drilling the hole which forms the mold for the stem of the column. rlhis rigging comprises a standard heavy automobile truck chassis having a rearwardly staggered derrick mounted upon the rear end thereof,- a rotar table constructed to be supported upon te derrick and project rearwardly therefrom at a suitable height above the ground, a power transmission whereby the rotary table is rotated by the motor on the chassis, a drill stem whereby a digging bucket may be rotated by the rotary table, and a cable drum operated b the chassis motor for raising the bucket rom the bottom of the hole ithas dug.

Itis another object of our invention there-v fore to provide an apparatus for forming a mold fora column with a base in which a cutting element is lowered to the bottom of a hole, already bored, and there rotated by a stem operated by a rotary table to cut a base mold cavity ofv extended diameterV from the walls of the hole:

. It is still another object to provide in an appara-tus for forming a mold for a columnV ywith a base, a guide member for the cutting element which'will cause the latter to be revolved by the drill stem in an orbit concentric with the hole.

It is an object of our invention to provide in an apparatus for forming a mold for a colmin with a base, means whereby the base mold forming cuttingA element may be held in retracted position within the guide member while it is being lowered into the hole loo .of the hole.

It is desirable to bore the hole and form the base mold while dry. It is therefore necessary to supply means for removing the detritus cut by the cutting element.

Thus another object of our invention is to provide in an apparatus for forming a mold for a column with a base, a bucket which follows the cutting element in its orbit and which automatically collects and retains the detritus removed by the cutting element.

vv.It is also an object of our invention to provide in an apparatus for forming a mold for a column with a base, means for retracting a bucket into a guide member and drawing both to' a point above the surface of the earth, whereby the dirt may be discharged from said bucket by gravity..

A further object of our invention is to provide in an apparatus for forming a mold for a column with a base, an elevated rotary table which will permit the dirt to be dumped from the bucket while it is beneath the table, thus obviating the necessity for the bucket passing through the rotary table in order for it to attain sufficient altitude to be conveniently dumped.

A still further object of our invention is to provide in an apparatus for forming a mold for a column with a base, a telescopic drill stem which will transmit the rotary movement of the rotary table to the aforesaid guide member and through the latter to the bucket in all positions ofthe bucket between retracted and extended positions.

Other objects and advantages will be made apparent in the following description and accompanying drawings in which,

D Fig. 1 is a diagrammatic vertical sectional view showing a complete apparatus comprismour invention.

ig. '2 is a horizontal section taken on the line 2-2 of Fig. 1.u U

Fig. 3 is a horizontal section taken on the line 3--3 of Fig. 1.

Fig. 4 is a horizontal section taken on the line 4-4 of Fig. 1.

Fig. 5 is a perspective viewof the guide member of our invention positioned at the bottom of a hole with the bucket in extended position and showing the undercut base mold as completed. D

Fig. 6 is a perspective View of the guide member as it appears when being raised or lowered through the hole and illustrating the bucket in retracted position.

F1g. 7 1s a-'perspective view illustrating the gulde member suspended from the frame of the rotary table in position for dumping detritus from the bucket which is here shown as re-extended from the guide member.

Fig. 8 1s a sectional view indicated byy the line 8--8 of Fig. v5, and showing the con- Fig. 10 is a' diagrammatic view illustratinlg I the utility of the extensible telescopic d stem which is utilized in our invention.

'Fig. 11 is a detail elevational view ofthe rotary digging bucket utilized in the apparatus of our invention for digging a stem mold cavityy in the earth.

Fig. 12 is a sectional view taken on the line 12-12 of Fig. 11.

Fig. 13 is a perspective view showing the bottom member of the digging bucket of our invention in .open position.

Referring to the drawings in detail, it 'will be seen in Fig. 1 that the mechanism of our invention is carried on a truck chassis 10 which is placed for carrying on its operation in approximatelythe position shown, rela- .tive to Da vertical cylindrical hole 11. This hole 11 may have been bored by and desired means previous to the commencing of the base mold forming operation, which is accomplished by means of our invention.

Constructed upon the truck chassis 10 is a derrick 12 which is staggered rearwardly as shown and is provided at the peak thereof with a crown block 13. A rotary table frame 15 is built upon the derrick 12 at a considerable height from the ground for a reason which will be explained later. In

this frame 15, horizontal members 16 project rearwardly from the derrick 12 and support a rotary table 17. The rotary table 17 comprises an annu1arshell 2O providing a ball ,race 21. This race 21 receives balls 22 upon which a rin gear 23` is' ada ted to rest and rotate. nL annular shou der 24 provided within the ringgear 23 supports a torque frame 25 which is constructed integrally with a splined sleeve 28, so that the latter is disposed concentricallyv with the ring gear 23. As shown in Fig. 2 the splined sleeve 28 is provided `with diametrically opposed internal lugs 29.

pinion 30 meshes with the ring gear 23 and is mounted upon the shaft 31 having l bearings 32 and 33sup orted upon the horizontal members 16. n the op osite end of the shaft 31 and immediately orward of the bearing 33 is mounted a sprocket 34 having a clutch face 35 formed on the hub thereof.: The sprocket 34 rotates freely upon the shaft 31. .A clutch member 36 is splined upon the forward end of the shaft 31 and is longitudinally movable thereon by rlmeans of a bell crank 37 which is mounted upon the frame 15.

A counter-shaft 40 is mounted upon they truck chassis 10 in bearings 4.1 and 42. Up

on the rearmost end of the shaft 40 is keyed a bevel pinion 45 which meshes with a bevel l which are mounted upon the truck frameA 10.' A clutch 50 is operably connected with the bevel gear 46 so that movement of a levei 51 in the direction indicated will connect the bevel gear 46 with a cable drum 52 so that the drum will rotate therewith. The sprocket 55 is mounted upon the shaft 40 so as to register with the sprocket 34 and a link belt 56 connects these two sprockets. A sprocket 60 is rotatable upon the forward end of the shaft 40 and the hub thereof is provided with a clutch face which is adapted to mesh with a clutch member 61 which is splined upon the shaft 40 when the lever 62 is moved in the direction indicated.

The truck frame 10 is that of an ordinary truck having front wheels (not shown) and a motor (not shown) situated at the front end of the truck. This motor is provided with a clutch (not shown) from which power is transmitted to a transmission 65 through a drive shaft 66. When the gears in the transmission 65 are properly meshed, power from the motor will be transmitted to the rear Wheels 68 through a rear drive shaft 67. A sprocket 70 is secured upon the shaft 66 in registry with the sprocket 60 and is connected to the sprocket 60 by a chain belt 71.

When the apparatus is positioned as shown in Fig. 1 relative to the hole 11, the ring gear 23 is co-aXially disposed relative to the cylindricalvhole 11.

Suspended within the splined sleeve 28 the outer tube 75 of a telescoping drill stem 76. An annular shoulder 77 formed around the'upper end of the tube 76 bears against the upper face ofthe splined sleeve 28, supporting the tube thereon. outer surface of the tube 7 5 throughout its length are formed integrally therewith di ametrically opposed keys 78 which are adapted to be engaged by the lugs 29, as illustrated in Fi 2. Within theplower portion of the tube 5 is formed a pair of oppositelugs` 80, as shown in Fig. 3. Disposed within the tube 75 is a tube 81 of reduced diameter which is provided throughout its length with diametrically opposed integral keys 82 which are adapted to bear against or be engaged by the lugs 80, as illustrated in Fig. 3. The tube 81 may slide` freely down into the tube 75 until an 'annular shouldery 84 formed around the upper end of the tube.81-engages the upper end of the lugs 80, at which point the tube 81 will be prevented from sliding downward-ly relative to the tube 75. Upon the lower end of theV tube l18 is formed va horizontal flange 86 which is secured by means of bolts 87 to :i

Along the v bail 88, the vertical arms of which pass on the inside of `and are secured at opposite points to the Walls of a -cylindrical guide member or shell90 by rivets 91. The shell 90 has a circular bottom plate 92 and a hole 93 is formed in the wall of the shell90 directly abovethe bottom 92, as illustrated clearly in Figs. 1 and 6.

Disposed within the shell 90 are'four arcuate tracks 95 which are held in the shell 90 in concentric relation with each other by means of brackets 96, which are rigidly secured to both the tracks 95 and the cylindrical wall of .the shell 90. As shown in Fig. 4, the tracks95 are disposed in embracing relationship about a rectangular space of uniform shape and area. A diaphragm is rigidly secured within the cylindrical shell 90 about the space occupied by the four tracks 95 and is secured to the tracks, acting as a brace. An arcuate digging bucket 103 is disposed in the space embraced by the four tracks 95 and is adapted to slide through an arcuate path determined by these tracks. The bucket 103 is rectangular in cross section and is formed of side walls 104, inner and outer arcuate walls 105 and 106 respectively, a hinged floor member 107, and a hinged detritus trap 108.

In Fig. 8 the hinged ioor member 107 is` shown as comprised of a plate having a bottom portion 110 and an end portion 111 bent perpendicularly upwardly from the bottom. Upon the inner edge of the bottoni portion 110 are formed tongues 112 which cooperate with similar tongues formed upon the outer wall 106 of the bucket 103 to form the hinge 113.` On the inner surface of the end plate 111 is rigidly secured a finger 115, the end portion 116 thereof being provided, with a slot 117. In the surface of the inner arcuate wall 105 near the lower edge thereof is formed an indentation 118 which forms a wall 119 disposed substantially parallel with and contacting the finger end 116 when the floor 107 is closed upwardly as shown in Fig. 8.

Means forlocki'ng the floor member 107 in closed position as sliown in Fig.' 8 is provided in aV bolt 120, adapted to be disposed through the slot 117, and a suitable hole formed in the wall 119 and(a having a squared head -121 bearing against the upper surface of the portion 119 and a lug 124 on the lower end thereof adapted to pass through the slot 117 when it is turned to register therewith and to resist passing through the slot 117 when it is turned, as shown in Fig. 9, across said slot 117. r.[hus

when it is desired to unlock'the ioor niemv ber 107 from its closed position as shown in which will release the floor 107 So that it opposite halves of the bottom edge of the may fall into the position in .which it is shell 205 are cut as shown in Fig. 13 to shown in Fig. 7 provide opposed helical edges 206 and 207. As shown in Figs. 5, 6 and 8 a cutting Diametrically opposed vertical edges 208 element in the form of a shoe 125 is bolted and 209 connect the adjacent ends of the to the outside of the floor member 107. A helical edges 206 and 207. tongue 126 of the cutting shoe 125 projects Hingedly attached by a hing'e 201t1 to the upwardly in the curve of the arcuate bucket shell 205 upon the helical edge 206, adjacent wall-105, into a cut-way recess 127 thereof. to the vertical edge 209, is a digging bucket Along the outer edge of this shoe 125 a bottom member 210. This bottom member sharp cutting edge is formed. is clearly illustrated in perspective in Fig. The trap 108, as shown in Fig. 8, com- 13.; The bottom member210 has oppositely prises a metal plate 130 supported by hinges disposedhalves 212 and 213 which are con- 131 which vare secured on the inner surface nected together integrally by a central web of the wall 104 adjacent to the cutting shoe 214 and vertical peripheral webs 215 andv 125 so that the-plate -130 hangs in a hole 216. Between the central web 214 and the t 132 formed in this wall 104. These hinges, peripheral webs 215 andy 216 are formed as will be readily understood, allow the openings 217 and 218. The lowermost edge plate 130 to swing inwardly from vertical 220 of the opening 217 is formed upon the position but rigidly resist the plate 130 lowermost radial element ofthe surface of swinging outwardly from vertical. the bottom member half portion 213, and the The bucket 103-has a bail 135, each of the lowermost edge 221 of the opening 218 is opposite arms of which are pivotally securedV formed at the lowermost similar element of by rivets 136 to the side walls 104 of the the bottom member half portion 212. The bucket 103 near the upper vedges thereof. A uppermost edges 223 and 224 of the openclamp 137 pivotally secures the lower end of ings 217 and 218 are formed upon the a rod 140 to the center of the bail. The rod uppermost similar elements of the bottom 140 passes vertically/upward through the member half portions 212 and 213 respec fthe bail 88 of the guide shell 90.

center of the inner tube 81'and is provided tively. The openings 217 and 218 are thus at its upper end with a swivel 142, this disposed, as shown in Fig. 11`, so that upon swivel connecting at its opposite end 143 a right hand rotation of the digging bucket with a cable 144. This cable passes ver* 198 the diametrically opposed openings 217 tically upwardly to the crown block 13 over and 218 will face in the direction of ro.- which it passes, vreturning downwardly tation. therefrom to wind around the cable The half portions 212 and 213 are helically drum 52. formedv about a center point 227 so that the When in the position shown in Fig. 7, the outer edges 228 and 229 thereof contact with guide member 90 is supported by hooks 148 the helical edges 206 and 207 respectively of .which connect the guide member bail 88 to the digging bucket shell 205 when the botthe rotary table torque frame 25. The use tom member 210 is in it's closed position as of these hooks 148 will be made clear in deshown in Fig. 11. scribing the operation. As also shown in Fig. 7, abelt conveyor 149 is provided hav- 233 slightly inclined inwardly from t e horiing a hinged iron frame 150. A lower drum zontal,'and yertical peripheral portions 234 151 and an upper drum 152 are mounted formed upon the portions 233 at the outer upon shafts 153 and 154 respectively, which ends thereof. The members 232 are secured are suitably journaled in bearings provided' upon the halves 212 and 213 of the bottom upon the frame 150. A continuous., conmember 210 so that each of. the cutting memveyor belt 155 passes'around the drums 151 bers 232 projects a slight distance downand 152, as shown. A worm and gear wardly from and in advance of one of the mechanism 157 connects an electric motor 'edges 220 and 221. Secured upon the bottom 158 with the shaft 154 for operating the member half portion 212 along the edge223 drum 152 and effecting the continuous moveif the opening 217 is a flap valve 238 which Cutting members 232 have bottom ortions ment of the conveyor belt 155 in the Vdirec;`V is of such size as to cover the hole 217 and i tion of 'the arrow 159. rest in overlapping relationship upon the op- .In' Figs. 10 to 13 is illustrated the rotary posite edge 220 of the hole 217. A` flap valve digging bucket 198 which may be utilized 240 identical with the valve 238 is secured for the boring of the vertical hole 11. This lin the same manner along the edge 244 of the bucket has a ,bail 200 which is attached to hole 218. The manner in which the flap the {hinge-86 of the lower end of the inner valves 238 are secured to the bottom memdrill stem tube 81 in thev same manner as ber 210 and the positionv in which they rest Y The lower when closed is best illustrated in Fig. 12.

ends 201 of thearms of the bail 202 are se` 'An elongated hole 242 is formed vin the curely attached. yto acylindrical diggingl bottom member 210 on the opposite side bucket shell 205, as shown in Fig. 11. The thereof from the hinge 201, A lip 243 is memset face of the lip 243 when the rod 245 is passed downwardly therethrough. The rod 245 is of such length as to permit the lower end 247 thereof to pass through the elongated opening 242 when the bottom member 210 is in closed position as shown in Fig. 11. An elongated head 249 is integrally formed upon the lower end 247 of the rod 245, the head 249 being of such size as to pass through the hole 242 when it is disposed in longitudinal registry with this hole. When the head 249 is passed 'downwardly throughthe hole 242, however, and the rod 245 given a quarter turn, the head 249 is disposed transversely relative to the elongated hole 242 and retains the bottom member 210 in closed position.

In order to dig the stem mold forming vcavity 11, the rotary diggin bucket 198 is secured to the lower end of t e drill stem 81 as shown in Fig. 11, and rotated by the rotary table 17. Thadigging bucket 198 is then lowered to rest upon the surface of the earth, and as it rotates in this position the cutters 232 borel into the earth. The detritus forced through the openings 217 and 220, disposed above lthe cutters 232,- passes upwardly within the-bucket 205 and is retained against returning outwardly through the openings 217 and 218 by the liap valves 238 and 240. When the space 260 within the shell 205 has received a suticient load ^of detritus the rotation of thegbucket 198 is stopped and the bucket is raised in the same'.

manner Yas previously described' for riising the base mold forming bucket to a position above the mouth 161 of the hole 11. While the bucket 198 is in this position, the conveyor 149 is disposed beneath the bucket 198 andthe rod 145 is then given a quarter turn.

This brings the head 249 in registry with the` elongated opening 242 so that the bottom member 210 swings into the open position'in which it is shown in Fig. 13, and the detritusp contained in the space 26.0 in the shell 205 is discharged downwardly by gravity, being carried to a remote dumping place upon-the belt 155 of the conveyor 149.

In the operation of our inventiomthe truck 10 carrying the derrick 12 and the rotary table 17 is positioned as shown in Fig. 1, the hole 11 having been previously drilled down to the bottom surface 160. At this time the tubes 75 and 81 of the telescopic drill stem are telescoped together and are held sufficiently upwardly 1n the splined sleeve 28 for the cylindrical guide member. 90 to be dispoed above the upper end 161 of the hole 11, as shown in Fig. 7. The floor member 107 of the bucket 103 is closed and' locked in closed position by turning the lug 124 across the opening 117. The motor (not shown) of the truck 10 is now put in operation, the

gears of the transmission remaining 1n neutral. The shaft 66 revolves with the motor, causing the sprockets 70 and 60 to rotate. The clutch 36 at thisy time is disen-l gaged. The clutch 61 is now moved into engagement with the sprocket 60 by moving the lever 62 in the 4direction indicated. This engagement of the clutch 61 causes a r0- tation of the shaft 40 with the shaft 66 and the consequent rotation with the Sprocket 55 of the sprocket 34. Likewise, the bevel gear 46 is rotated in mesh with the bevel pinion 45. The lever 51 is now moved in the direction indicated, causing the cable drum 52 to wind up the cable 144 and lift the bucket 103 upwardly until the clamp 137 engages the lower surface of the bail 88. This draws the bucket 103 upwardly into retracted position, as illustrated in Fig. 6, and continued application of tension to the cable 144 through the cable drum 52 raises the telescopic drill stem 76 and the c lindrical guide shell 90 upwardly until the ooks 148 may be removed from the hooking relation as shown in Fig. 7. Upon release of the 1ever451, the tension on. the. cable will be gradually lessened and the cylindrical guide4 shell 90 with the bucket 103 disposed in retracted position therein, as illustrated in Fig. 6, will move gradually downwardly due to gravity through the length of the hole 11 until the-bottom plate 92 contacts the bottom` 160 of the hole 11. All tension on the cable 144 being released, the weight of the rod 140lis transmitted downwardl throu h the bail `l35'toth'e bucket 103. s.will e seen, at this time .the angle formed between the tongue 126 and the end portion of the cutting ,element 125 contacts the surface of the hole 11 with 'all the weight of the bucket 103, the bail- 135 and the rod 140 tending to force it into the wall. l

The clutch 36 is now moved into engagement with the clutch face 35 of the sprocket `34 by manipulation of the lever 37 thus causing the rotation of the shaft 31. The pinion y30 being in mesh with the ring gear 23, the latter is thus caused to rotate. Rotating with the ring gear 23, the torque frame 25 transmits its rotation through the lugs '29 to the keys 78 of the outer tube 75 of the telescoping drill stem 76. The rotation of the tube is transmitted through the lugs 80 to the keys 82 of the smaller tube As the rotation of' iis that the bucket 103 is constantly fed downwardly by its own weightin the arcuate path of the tracks 95, as best illustrated in Fig. 1. In this figure the bucket 103 is shown partially descended from its retracted position toward its extended position and detritus 180 is shown as having collected inside the bucket 103 due to the action of the cutting blade turning away the dirt from the surface of the hole 11. In this figure a hole 182 is shown as having been turned away and the dotted line 183 indicates the shape of the hole as it will be when the dirt will have been entirely removed. As the dirt is removed by the cutting element 125, it pushes its way into the bucket past the tra 108 and forces dirt already in the buc et 103 upwardly so as to make room for itself in `the bottom of the bucket.

We have made extensive use of this in vention in experimenting'to perfect it and have found it convenient to raise the bucket 103 and the guide member 90 from the hole and dump the detritus collected in the bucket 103 several times during the opera` tion of cutting the complete form of a column base as indicated by the dotted line 183 in Fig. 1, and as shown'inperspective in Fig. 5;*- At any time when the operator 30 )perceives that a sufficient amount of detritus as collected in the bucket 103 tol make it desirable to remove the same therefrom, it

, is only necessary by manual operation of the lever 37 to disconnect the clutch 36 fromthe clutch 35, thereby stopping rotation of the guide member 90, and by movement of the i "lever 51.in the indicated direction to cause a tension to be placed upon the cable 144.

vThis tension transmitted through the bail 135 to the bucket 103 will draw the bucket into retracted position, as illustrated in Fig. 6, until the clam 137 contacts the lower surface of the bail 88. Then and not until then will 'the upward tension of the cable 144 be transmitted to the guide member 90 and starty drawing it upwardly from the hole 11.V Thus itvwill be seen that there is no possibilityof the bucketv 103 obstructing the upward movement of the guide member 90 by remaining in the cavity 182. Upon arrival of the bail 88 at a position in close proximity to the torque frame 25, as shown 1n Fig. 7, the hooks 148 are positioned to connect the bail 88 with the torque frame 25 and the tension upon the cable 144 is then released. This will throw the weight of the member 90 and drill stem 75 upon the torque frame 25 and will allow the bucket 103 to slide downwardly through an arcuate path .out of the hole 93. into the position substantially in which it is shown in Fig. 5, though instead. of being at the bottomof the hole it will be at the top of the hole as shown in Fig. 7. The conveyor 149 is now ositioned beneath the guide member 90 an the noejaos wrench is applied to the squared head 121 of the locking bolt 120 and this bolt is turned a quarter of a revolution. This unlocks the hinged floor 107 which opens as shown in Fig. 7. The conveyor being in motion, the detritus as it falls from the bucket 103 is carried on the conveyor belt 155 to a remote place from the hole 11 where it is dumped. Due to the angle of the outer arcuate plate 106 of the bucket 103, the detritus leaves the bucket entirely by gravity. The floor 107 is then re-locked in closed position and the operation as above described is repeated until the cavity 182 is enlarged to the outline indicated by the dotted line 183.

We claim as our invention:

1. In an apparatus for forming a mold for a column with a base, means for removing material surrounding the extreme lower portion of said mold in order-to form an enlarged base portion for the mold, said removing means including a cutting device and a receptacle for receiving material direct from said cutting device.

2. In an apparatus for forming a mold for a column with a base, means for removing material l surrounding the extremeA lower portion ofsaid mold in order to form an enlarged base portion for the mold, said removing means including a cutting device, a receptacle for receiving material direct from said cutting device, and means for discharging said material from said receptacle.

3. In an` apparatus of the class described, the combination of: a guide member adapted to be rotated in a hole; means for lowering said member to the bottom of said hole and raising it therefrom; means for rotating said member at the bottom of said hole; a bucket movably mounted upon said guide member and having retracted and extended positions relative thereto; means for moving said bucket between retracted and extended. positions; cutting means provided upon said bucket, said cutting means being adapted to cut awaythe material surrounding said hole as said bucket moves from retracted position to extended position while said guide member is rotated; and means for capturing theV detritus so removed in said bucket.

4. In an apparatusiof the class described, the combination of: a guide member adapted to be rotated in a hole; a cable for lowering said member to the bottom of said hole and raising it therefrom a swivel connecting said member and said cable; a telescopic drill stem secured at its lower end to said member and comprising concentrically disposed tubes of successivel diminishing diameter, each slidable w-ithm the next larger tube and keyed thereto, the aforesaid cable passing through the center of said drill stem; means located outside said hole for rotating said drlll stem; a bucket movably mounted upon 30 to extended position While said gui a position when said cable is supporting said guide member and to tend of its own weight to move to extended position when said guide member rests upon the bottom of said hole; cutting means provided upon said bucket, said cutting means being adapted to cut away the material surrounding said hole as said bucket moves from retracted position to extended position while said guide member is rotated; and means for capturing le the detritus so removed in said bucket.

5. In an apparatus of the class described, the combination of: a guide member adapted to be rotated in a hole; means for lowering .said member to the bottom of said hole and raising it therefrom; means for rotating said member at the bottom of said hole; a bucket movably mounted upon said guide member and having retracted and extended ositlons relative thereto; means for moving said bucket between retracted and extended positions; cutting means provided upon said bucket, said cutting means .being adapted 'to cut away the material surrounding said hole as said bucket moves from retracted (position e member is rotated; means for capturing the detritus so removed in said bucket; and means for discharging the detritus from said bucket when said`guide member has been raised out of said hole. 6. In an apparatus ofv the class described, the combination of: a guide member adapted to be rotated in a hole; a cable for lowering said member to the bottom of said hole and raising it therefrom; a swivel connecting said member and saidV4 cable; a telescopic drill stem secured at its lowerend to said member and comprising concentrically disposed tubes of successively diminishing diameter, each slidable within the next larger tube and keyed thereto; the aforesaid cable passing through the center of said drill stem; means located outside said hole for rotating said drill stem; a bucket movably mounted upon said guide member andhav'- ing retracted and extended positions vrelative thereto, said bucket being attached to the lower end of said cable so as to be drawn into retracted position when said cable is suporting said guide member and to tend of 1ts own weight to move to extended position when said guide member rests upon the bottom of said hole; cutting means provided upon said bucket,said cutting means being adapted to cut awaythe material surrounding said hole as said bucket moves from retracted position to extended position while said guide member is rotated; means for capturing the detritus so removed in said bucket; and means for discharging the detritus from said bucket when said guide member has been raised out of said hole.

7. In an apparatus of the class described, the combination ofz'a guide member adapted to be rotated in a hole; means for lowering said member to the bottom of said hole and raising it therefrom; means for rotating said member at the bottom of said hole; a bucket movably mounted upon said guide member and having retracted and extended positions relative thereto; means for moving said bucket between retracted and extended positions; cutting means provided upon said bucket, said cutting means being adapted to cut away the material surrounding said hole as said bucket moves from retracted position to extended position while said guide member is rotated; and a trap provided in said bucket adjacent to said cutting means, said trap permitting detritus to enter said bucket and retaining it therein.

8. In an apparatus of the class described, the combination of: a guide member adapted to be rotated in a hole; a cable for lowering said member tothe bottom of said hole and raising it therefrom; a swivel connecting said member and said cable; a telescopic drill stem secured at its lower end to said member and comprising concentrically disposed ytubes of successively dlmmishmg diameter,

ing through the center of said drill stem;

means located outside said hole for rotating vsaid drill stem; a bucket movably mounted upon said guide member and having retracted and extended positions relative thereto; said bucket being attached to the lower end of said cable as to be drawn into retracted position when said cable is supporting said guide member and to tend of its own weight to move'to extended position when said guide member rests upon the bottom of said hole; cutting means provided upon said bucket, said cutting means being adapted to cut away the material surrounding said hole as said bucketmove's from retracted position said guide member is rotated; and a trap provided in said bucket adjacent to said cutting means. said trap permitting detritus to enter said bucket and 'retaining' it therein.

9. In an apparatus of the class described, the combination of: a guide member adapted to be rotated in a hole; means for lowering said member to ythe bottom of saidihole and raising it therefrom; means for rotating said member at the bottom of said hole; a bucket movably mounted upon said guide member and having retracted and extended positions relative thereto; means for movinfr said bucket between retracted and extended tions; cutting 4means provided upon said bucket, said cutting means being adapted to to extendedy position while posi-` floor provided in said bucket having closed and open positions; and locking means holding said floor in closed position during the cutting operation in said hole, and being releasable to. allow said lloor to move to open position to discharge detritus from said bucket when said guide member has been raised out of said hole.

10. In an apparatus of the class described, the combination of: a guide member adapted to be rotated in a hole; acable for lowering said member to the bottom of said hole and raising it therefrom; a swivel connecting said member and said cable; a telescopic drill stein secured at its lower end to said member and comprising concentrically disposed tubes of successively diminishing diameter, each slidable within the next larger tube and keyed thereto, the aforesaid cable passing through the center of said drill stem; means located outside said hole for rotating said drill stem; a bucket inovably mounted upon said guide member and having retracted and extended positions relative thereto, said bucket being attached to the lower end of said cable so as to be drawn into retracted position when said cable is supporting said guide member and to tend of its own weight to move to extended position when said guide memberfrests upon the bottom of said hole; cutting means provided upon said bucket, ysaid cutting -means being adapted to cut awaythe material surrounding said `hole as fbucket moves from retracted posltlon to ex.

said bucket moves from retracted position to extended position while said guidemember is rotated; means for capturing the detritus so removed in said bucket; a hinged floor provided in said bucket having closed and open positions; andlocking means holding said floor in closedposition during ,the cuttingoperation in said hole, and being releasable to allow saidloor to move to' open 'position to discharge detritus from said member. has been bucket when said guide raised out of said hole. c

11. In an apparatus of the class described, the 'combination of:` a guide member'adapted to be rotated in a hole; means for lowering said member to the bottom of said hole and raising it therefrom; means for rotating said member at the bottom of said hole; a bucket movably mounted upon said guide member and having retracted and extended positions relative thereto; means for moving said bucket between retracted and extended positions; cutting means provided upon said bucket, said cutting means being adapted to cut away the material surrounding said hole as .said 'bucket moves from retracted position to extended osition while said guide member is rotate a trap proto open position to discharge detritus from said bucket when said guide member has been raised out-of said hole.

12. In an apparatus of the class described, the combination of: a guide member adapted to be rotated in a hole; a cablefor lowering said member to the bottom of said hole and raising it therefrom; a swivel connect;l

ing said member and said cable; a telescopic drill stem secured at its lower end to said member and comprising concentrically disposed tubes of successively diminishing diameter, each slidable within the next larger tube and, keyed thereto, the aforesaid cable passing through the center of said drill stem; means located outside said hole for rotating said drill stem; a bucket movably mounted upon said guide member and having retracted and extended positions relative thereto, said bucket beingv attached to the lower end of said cable so as to be drawn into retracted position when said cable is Jsupporting-(said guide member and to-tend of its own weight to move to extended position when said guide member rests upon the bottom of said hole; cutting means provided upon ysaid bucket, said cutting means Ibeing adapted to cut away the materiali surrounding said hole as. said tended position vwhile `said guide member is rotated a trap provided in said (bucket adjacent to said'cutting means, said trap permitting detritus-to enter said bucket and'retaining it therein; a hinged Hoor provided in said bucket having closedland open positions; and locking means holding 'said floor in closed position during the cutting `voperation in said hplc, and being releasable to allow said floor to move to open position to discharge detritus from said bucket when said guidev member has been raised out of said hole.

13. In an apparatus ofthe class described,

the combination of: a guide member adapted to be rotated in a hole; means for lowering said member, to the bottom .of said hole and raising it therefrom; means for rotating-said member at the bottom'of said hole; an arcuately formed bucket mounted upon said guide member to move in an arcuate path concentric with the curves of its form and having retracted and extended positions relative to said guide member; means for moving said buc et between retracted and extended positions; cutting means provided upon said bucket, said cutting means being `stem adapted to cut away the material surrounding said hole as said bucket moves from retracted position -to extended position while said guide member is rotated; and means for capturing the detritus so removed in said bucket.

14. In an apparatus of the class described, the combination of: a guide member adapt.- ed to be rotated in a hole; a cable for lowersaid member to the bottom of said hole and raising it therefrom; a swivel connecting said member and said acable; a telescopic drill stem secured at its lower end to said member and comprising concentrically disposed tubes of successively diminishing diameter, -each slidable within the next larger tube and keyed thereto, the aforesaid cable passing through the center' of said drill stem; a rotary table. vfor rotating said drill rovided a sufficient distance above the top o said hole to permit the guide -member to be suspended therefrom and be entirely removed from the hole for dumping detritus from said bucket; a bucket movably mounted upon said guide member and having retracted and. extended positions relative thereto, said bucket being attached ,to the lower end of said cable so as to be drawn into retracted position when said cable is supv tracted position to extended position whileV said guide member is rotated; means .for f p ior a. column with a base, a guide member capturing the ldetritus so removedsin said bucket; and means for discharging the detritus from said bucket when in dumping position.

15. In a machine of,4 the class described,

an under cutting element comprisingz' a cy lindrical lshell having aclosed bottom, an open top Aand an opening in said shell just above said bottom; a bail secured to said shell above said -open top; a hollow ro-' tary stem secured. tosaid bail for rotating said shell; arcuate tracks provided in said shell an arcuate bucket slidable in said tracks and adapted to move between aposition retracted within said shell and a position extended out through said hole therein; a bail secured on the upper end of said bucket; a cable extending down through said hollow stem and secured at its lower end to said bucket bail; a cutting element provided upon the lower portion of said bucket; and a trap formed in the wallA of said bucket adjacent said cutting element for receiving detritus, removed by said element, into said bucket and retaining it there- 16. In an apparatus for forming a mold ing material surrounding the extreme lowe-r portion of said' mold in order to form an enlarged base portion for the mold, said removmg means including a cutting device, a receptacle .for receiving material direct from said cutting device, means for withdrawing said receptacle from the mold and means for emptying said receptacle.

18. In an apparatus for forming a mold for a column with a base, a guide member supported by the mold for the column, a cutting device supported by said member, a receptacle coordinated with said cuttin device i'or receiving detritus direct there rom, and means for actuating said cutting device to radially enlarge a portionfof said mold.

1.9. In an apparatus for forming a mold for a column with a base, a guide member supported by the mold for the column, a- Acutting ldevice supported by said member, a

receptacle coordinated with said cuttin device or'receiving detritus direct there rom, means for radially extending said cutting device'and receptacle','and means for actuating said cutting device to enlarge a portion of said mold. i J

20. In an apparatus for forming la mold supported by the mold for the column, a'

cutting device supported by said member a e- ,vice for receiving detritus direct` there om, A

receptacle coordinated with said cuttin means for radially extending said cutting device and receptacle, means for actuating said icutting device while extended, and means for 22; 'In an apparatus for forming a mold for a column with a base, a guide member supported by the mold for the column, 'a

cutting devicev supported by said member, a

receptacle coordinated with said cutting device for receiving detritus direct therefrom, means for radially extending said cutting device and receptacle, means for actuating said cutting device While extended, means for retracting said receptacle while containing material received from said cutting dememset vice, and means for discharging the material from said receptacle outside of said mold.

In testimony whereof, We have hereunto set 10 our hands at Los Angeles, California, this 19th day of April, 1926.

FRANCIS H. HUNT. FRANK N. ROPP. 

